﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Clr._4
{
    public class Employee
    {
        public string A { get; set; }
        public Employee()
        {
            
        }

        public static void D(object o)
        {
            var a = (Employee)o;
            a.A = "hello";
        }
    }
}
